Drawing roll for spinning frames



June 1944- L. 'w. CAMPBELL 2,352,167

DRAWING ROLL FOR SPINNING FRAMES Filed July '2, 1941 mzje'7zyo 7' Leo/v W. CAMPBELL Patented June 27, 1944 UNI-TE Y S A P E T DRAWING .ROLL FOR SPINNING FRAMES- Leon W'. IC ampbell, Hendersonville, N. .o. Application July 2, 1941, Serial'No. 400,775

' S Claims. or/194.1 42) "My'invention' relates to drawing-rolls for cotton spinning, drawing, roving and the like frames on the order of those shown in'my prior U. S. Patent No.-1; 286,936, granted December 10, 1918, and-has among its objects the provision of a novel and improved double-boss top-roll of which the bosses can each rotate at its own speed independently of the other,'so that the inevitable slight-checks of the rotation ofone boss caused by neps, pieces of boll or leaf, or other inequalities in oneof the two strands being drawn by the roll will not be imparted to the other boss to'cause it to hold back on its strand and introduce unevenness in thela'tter strand. Another object is to provide a roll inwhich the rise. and fall of one boss over inequalities of the strand. will not similarly lift one end or the other of the other boss on the roll. A further object is to provide a roll capable of being mounted in the usual slotted cap-bars of existing frames without modification thereof, which roll will be equipped with anti-friction- '-bearings giving greater uniformity of draft, andto'do so while providing a structure capable of being taken apart for servicing and of being put together again without the need for skilled labor and great care and precision in order to avoid error of adjustment preventing proper operation.

Other objects of the invention, and the manner of their attainment, are as setforth hereinafter in thespecification.

An illustrative embodiment of the invention is shown in the accompanying drawing in which;

Fig. 1 is a view mainly in longitudinal axial section of theirnproved roll. I

Fig. 2 is a transverse section on line 2--2 of Fig.3 is a transverse section on line 3 -3 of The improved roll comprises two spindles l, which together form a central non-rotating arbor on whichjshell rolls 5 are mounted in independently rotatable relation and held in fixed spaced relation bypbushings I on the reduced inward ends of the spindles I. Thus, each spindle I is formed .with an, outward extremity 9 of the proper size tobe received easily and work up and down freely in the customary open bearings of the usual type cap-bars of the spinning frame, the surfaces of these extremities 9 being cylindrical at first and thereafter expanding to form flanges l l whose inward radially disposed faces bear against annular shoulders l3 formed at one end of the reduced middle portion of the central passage of the shells 5 comprising the two bosses of the roll; Flange II is of such diameter that 'it will rotate freely within the enlarged end portion I5 of the passage through each she11 5.

Spindles I are hardened and ground to "size. Into the middle portion 1'! of reduced diameter of the passage through each shell is driven with a press fit the cage [9 of a-needle-bearing whose several rolls 2| bear against the reduced cylindrical shank 23 of spindles I, so that each she'll rotates freely upon such shank 23 by reason of the interposed needle-bearings. The bushings 1 fit snugly upon the reduced shanks 23 with their flanged outward extremities 25 received freely within the enlarged inward ends of "the central passages through the shells and bearingagainst the shoulder at the inward terminus of the reduced'portion ll of such-passages, so that the shells are held' against axial movement along spindles I betweenthe flanges Hof -the spindles'an'd flanges 25 of the bushings.

The two spindles are connected together in slightly spaced relation at their inward ends by means of longitudinally-split cylindrical clips 21 ofC-shape in section made out of spring steel and of an internal diameter slightly less than the diameter of the shanks 23 so that they will grip the latter tightly when the shanks are forced into the clip. Each' shank is provided near its end with an annular rectangular groove 29 to receive a radially extending lug 3| formed at each end of the C-clip 21, the grooves 29 being accur'ately located so that the lugs 3| will enter grooves 29 just as flanges 25 of bushing 1' take 'closebut free bearing against the shoulderson reduced portions I"! against which they bear [within theshells 5. Thus, with the C-clip 21 uniting the inward ends of spindles l the whole assembly becomes a single top-roll unit comprising two bosses freely and independently rotat able infixed axially-spaced relation upon an 'op- 'eratively 'rigid arbor the; ends of which are' refceived in usual manner in the open bearings of the cap-bars. The two bushings l and the intervening C-clip act as spacers "determining the axial spacing of the two bosses. I

ment with the common axis of the two co-aligned spindles I, this rocking action being amplified in effect because each needle-bearing is roughly only about one-third the length of its shell. The effect of this is that though both bosses of the roll are mounted to rotate on a common axis, yet when an inequality in one strand lifts the boss at one end of the roll and its corresponding end ofthe common axis, the boss at the other end of the roll can continue to rotate in correct and accurate parallelism with the surface of the opposing lower roll against which it is pressed and thus maintain its intended grip on all the between it and its underlying bottom roll. This self-leveling action avoids the fault, in prior rolls in which the bosses were forced to remain in exact axial alignment at all times, of having for lint and fly to enter or accumulate in the bearings; this freedom from clogging and the long life of the bearings makes it possible to run these rolls ordinarily for around two years under customary working conditions without having to take them apart for cleaning and oiling.

What I claim as my invention is:

1. A drawing-roll having in combination two shell rolls each having internal shoulders, a needle-bearing fixed within each shell roll and located between the internal shoulders, a spindle extending through each shell roll and needlebearing and having a flange bearing against one fibers of the cross-section of the strand gripped one boss tilted out of parallel with its underlying roll when the other boss was forced to rise by an inequality in its strand, thus permittingthe fibers at the raised ends of the first-boss to draw forward without restraint to throw the resulting drawn: strand momentarily out of uniformity. Thus ;the fulcrum about which the top-roll swings when one boss is raised or lowered is no longerin' the strand below the other boss, but in theaxis of the latter'boss-at mid-length of its bearing.

- The usual: weighting means is applied to the improved top-roll when desired by applying the saddle of such means to the exposed portions of bushings 1 between the ends of the-two shells 5, this pressure efiectively holding the spindles and bushings from rotation in use, though the engagement of pintles 9 within the open bearings of .the cap-bars normally accomplishes this retention from rotation since the anti-friction needie-bearings permit free rotation of the shells without motion of the parts desired to remain at rest.

Disassembling of the structure, for servicing or replacement of the needle-bearings or other parts, or to facilitate recovering the shells 5, is accomplished by merely springing the C-clips open far enough to get the lugs 3| out of grooves -29, 'the parts thereafter being separated by relative axial movement. This done, the bushing I and shell 5 with the needle bearing in place are slid ofi from spindle l. ---Re-assembly is efiected with the'ut'most simplicityby a reversal of this operation; and there is no possibility for error on the part of the operator'in getting an improper setting of the parts, because with accurate machining of the parts to close tolerances and with complete standardization the component elements canbe put together only in a manner giving correct operation; there is no leeway for personal error.

As is'obvious; any checking or pause in the rotation of one boss owing to'obstacles encoun- 'teredin its strand will have no efiect in checking the rotation of the otherboss, because they are mounted for rotation completely independently of each other.

.Withthe needle-bearings located at mid-length oi the shells 5,-there is little or no opportunity arbor comprising two separate lengths each having an enlarged end-portion and a reduced shank having a groove, a shell roll on'each length, means holding the shell roll against axial movement, and connector means fitting over the proximate ends of the shanks and having a portion entering the groove of each shank to hold the two lengths together in axial alignment. 3. A drawing roll having in combination an arbor composed of two separate lengths disposed end to end and each having an enlarged 31 dportion and a reduced shank, a shell roll on each length, a needle-bearing having its cage fixed within each shell roll and its rollers bearing against the arbor to support the shell rolls rotatably thereon, means coacting with the enlarged end-portions to hold the shell rolls against axial movement, and means positively but detachably locking the proximate ends of the sai lengths together in axial alignment.

4. A drawing roll having in combinationjl-an movement of the shell rolls, and means positively but detachably locking the proximate ends of the said lengths together in axial alignment and also holding ,thesleeves againstinward movement. a Y

5. A drawing roll having in combination a nonrotating arbor, two shell rollsmounted in'axially spaced relation to each other upon such arbor, and a needle bearing comprising rollers 'a'rid'a cage retaining the rollers against axial andinward or outward radial displacement and'having its cage fixed in the interior of each} shell roll at midlengththereof and thusremovable from the arbor while remaining fixed in the shell roll when the latter is removed from the arbor, and bearing against the arbor to support each shell rotatably upon the arbor. LEON W. CAMPBEIL j, 

